期刊
GEOPHYSICAL RESEARCH LETTERS
卷 43, 期 18, 页码 9913-9919出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL070203
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资金
- U.S. National Science Foundation [1203533, 0922816]
- External Cooperation Project of Chinese Arctic and Antarctic Administration [IC201503]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0922816] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1443663, 1203533] Funding Source: National Science Foundation
Perchlorate concentration ranges from a few to a few hundred ng kg(-1) in surface and shallow-depth snow at three Antarctic locations (South Pole, Dome A, and central West Antarctica), with significant spatial variations dependent on snow accumulation rate and/or atmospheric production rate. An obvious trend of increasing perchlorate since the 1970s is seen in South Pole snow. The trend is possibly the result of stratospheric chlorine levels elevated by anthropogenic chlorine emissions; this is supported by the timing of a similar trend at Dome A. Alternatively, the trend may stem from postdepositional loss of snowpack perchlorate or a combination of both. The possible impact of stratospheric chlorine is consistent with evidence of perchlorate production in the stratosphere. Additionally, perchlorate concentration appears to be directly affected by the springtime Antarctic ozone hole. Therefore, perchlorate variations in Antarctic snow are likely linked to stratospheric chemistry and ozone over the Antarctic.
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